Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
duc cuu » duc suu
va minh » van minh, vua minh, va kinh
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ty ((nang xa) or (nang ma)) hoi. hieu ((va cam) OR (va cao)) luc va minh duc cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty ((nang xa) OR (nang ma)) hoi. hieu ((va cam) OR (va cao)) luc va minh duc cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ty ((nang xa) or (nang ma)) hoi. hieu ((va cam) OR (va cao)) luc va minh duc cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty ((nang xa) or (nang ma)) hoi. hieu ((va cam) OR (va cao)) luc va minh duc cuu tre*.